Are you POSITIVE that the freezer temps is NOT below 32 degrees? As I stated, the freezer should be below 10 degrees. Also, the temp Thermister control does NOT regulate the freezer. The fact that the freezer will be above 32 degrees points to a lack of Thermal mastic or lack of correct amount of thermal Mastic when the cooling unit was installed. You can NEVER have too much thermal mastic. Why the 6 months of operation? maybe because between the Thermal Mastic and probably the lack of sealing the Cooling Unit to the box correctly, the refer has too many air leaks. I have NEVER seen a RV absorbsion refer have less than 50 degrees in the lower section and above 32 degrees in the Freezer. That goes back 36 years as a Service Technician. The problem is this, to check the sealing of the CU to the box and the amount of Thermal Mastic requires the refer to be pulled and the CU to be pulled. At this point, that is the only option. Doug